Update submodule, change the source file list
rename CACHE_LINE_SIZE in ut0counter, so it does not conflics with
rocksdb sources, which also defines this constant now.
use CMAKE_CXX_STANDARD to set C++11 flags with CMake 3.1+ (apples flags are somehow different from standard clang)
port htonbe16/32/64 macros for rocksdb
use reinterpret_cast<size_t> to cast macOS's pthread_t (pointer type) to size_t , for rocksdb
